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Fluid identification and tight oil layer classification for the southwestern Mahu Sag,Junggar Basin using NMR logging-based spectrum decomposition
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作者 Wenbiao Huang Yibing Guo +4 位作者 Jun Qin Zhongchen Ba Zongbin Zhang Luning Bai Heng Li 《Energy Geoscience》 EI 2024年第2期62-69,共8页
The intricate distribution of oil and water in tight rocks makes pinpointing oil layers challenging.While conventional identification methods offer potential solutions,their limited accuracy precludes them from being ... The intricate distribution of oil and water in tight rocks makes pinpointing oil layers challenging.While conventional identification methods offer potential solutions,their limited accuracy precludes them from being effective in their applications to unconventional reservoirs.This study employed nuclear magnetic resonance(NMR)spectrum decomposition to dissect the NMR T_(2)spectrum into multiple subspectra.Furthermore,it employed laboratory NMR experiments to ascertain the fluid properties of these sub-spectra,aiming to enhance identification accuracy.The findings indicate that fluids of distinct properties overlap in the T_(2)spectra,with bound water,movable water,bound oil,and movable oil appearing sequentially from the low-value zone to the high-value zone.Consequently,an oil layer classification scheme was proposed,which considers the physical properties of reservoirs,oil-bearing capacity,and the characteristics of both mobility and the oil-water two-phase flow.When applied to tight oil layer identification,the scheme's outcomes align closely with actual test results.A horizontal well,deployed based on these findings,has produced high-yield industrial oil flow,underscoring the precision and dependability of this new approach. 展开更多
关键词 Nuclear magnetic resonance Fluid identification oil layer identification NMR T_(2)spectrum decomposition Normal distribution simulation
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Micro-geological causes and macro-geological controlling factors of low-resistivity oil layers in the Puao Oilfield 被引量:5
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作者 Tan Fengqi Li Hongqi +2 位作者 Liu Hongtao Jiang Fucong Yu Hongyan 《Petroleum Science》 SCIE CAS CSCD 2009年第3期246-253,共8页
Low-resistivity oil layers are often missed in logging interpretation because of their resistivity close to or below the resistivity of nearby water layers. Typical low-resistivity oil layers have been found in the pa... Low-resistivity oil layers are often missed in logging interpretation because of their resistivity close to or below the resistivity of nearby water layers. Typical low-resistivity oil layers have been found in the past few years in the Putaohua reservoir of the Puao Oilfield in the south of the Daqing placanticline by detailed exploration. Based on a study of micro-geological causes of low-resistivity oil layers, the macro-geological controlling factors were analyzed through comprehensive research of regional depositional background, geological structure, and oil-water relations combined with core, water testing, well logging, and scanning electron microscopy data. The results showed that the formation and distribution of Putaohua low-resistivity oil layers in the Puao Oilfield were controlled by depositional environment, sedimentary facies, diagenesis, motive power of hydrocarbon accumulation, and acidity and alkalinity of reservoir liquid. The low-resistivity oil layers caused by high bound-water saturation were controlled by deposition and diagenesis, those caused by high free-water saturation were controlled by structural amplitude and motive power of hydrocarbon accumulation. Those caused by formation water with high salinity were controlled by the ancient saline water depositional environment and faulted structure and those caused by additional conductivity of shale were controlled by paleoclimate and acidity and alkalinity of reservoir liquid. Consideration of both micro-geological causes and macro-geological controlling factors is important in identifying low-resistivity oil layers. 展开更多
关键词 Daqing placanticline Puao oilfield Putaohua oil layer low-resistivity oil layers microgeological causes macro-geological controlling factors
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Seismic identification of channel sandbodies in the Fuyang oil layer in North Songliao Basin, China
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作者 Liu Jinping Wang Yunqing +3 位作者 Yang Maoxin Xie Chunlai Zhao Xiuhong Chen Shumei 《Applied Geophysics》 SCIE CSCD 2007年第2期127-132,共6页
The Fuyang oil-layer in North Songliao Basin is characterized by thin interbedded sands and shales, strong lateral variation, strong reservoir heterogeniety, and so on. The thickness of individual sand layers is gener... The Fuyang oil-layer in North Songliao Basin is characterized by thin interbedded sands and shales, strong lateral variation, strong reservoir heterogeniety, and so on. The thickness of individual sand layers is generally 3 - 5 m. Identifying the channel sand-bodies of the Fuyang oil layer using seismic techniques is very difficult due to the low seismic resolution. Taking the GTZ area as an example, we discuss the genetic characteristics of the channel sand-bodies and point out the real difficulty in using seismic techniques to predict the channel sand-bodies. Two methods for the identification of channels are presented: frequency spectrum imaging and pre-stack azimuthal anisotropy. Identifying the channel sand-bodies in Fuyu oil-layer using the two seismic methods results in a success rate up to 80% compared with well data. 展开更多
关键词 Seismic technique Fuyang oil layer channel sand frequency spectrum imaging azimuthal anisotropy
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Pore structure differences of the extra-low permeability sandstone reservoirs and the causes of low resistivity oil layers: A case study of Block Yanwumao in the middle of Ordos Basin, NW China 被引量:3
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作者 WANG Jianmin ZHANG San 《Petroleum Exploration and Development》 2018年第2期273-280,共8页
The influence of pore structure difference on rock electrical characteristics of reservoir and oil reservoir was analyzed taking Triassic Chang 6 reservoir in Block Yanwumao in the middle of Ordos Basin as an example.... The influence of pore structure difference on rock electrical characteristics of reservoir and oil reservoir was analyzed taking Triassic Chang 6 reservoir in Block Yanwumao in the middle of Ordos Basin as an example. The relationship between the pore structure difference and the low resistivity oil layer was revealed and demonstrated through core observation, lab experiments, geological research, well log interpretation and trial production etc. The results show that there were two kinds of oil layers in Chang 6 oil layer set, normal oil layer and low resistivity oil layer in the region, corresponding to two types of pore structures, pore type mono-medium and micro-fracture-pore type double-medium; the development of micro-fracture changed greatly the micro-pore structure of the reservoir, and the pore structure difference had an important influence on the rock electrical characteristics of the extra-low permeability sandstone reservoir and oil reservoir; the normal oil layers had obvious characteristics of pore-type mono-medium, and were concentrated in Chang 61, Chang 6232 and Chang 62; the low resistivity oil layers had obvious characteristics of micro-fracture-pore type double-medium, which were mainly distributed in Chang 612 and Chang 63. The mud filtrate penetrated deep into the oil layers along the micro-cracks, leading to sharp reduction of resistivity, and thus low resistivity of the oil layer; the low resistivity oil layers had better storage capacity and higher productivity than the normal oil layers. 展开更多
关键词 ORDOS Basin Chang 6 oil layers extra-low permeability reservoir LOW RESISTIVITY oil layer pore structure MUD invasion LOW RESISTIVITY cause
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Palm Oil Microencapsulation by Coacervation, Thin Layer Drying, and Silica Dioxide Absorption Technique
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作者 Nur Wulandari Tien R. Muchtadi +1 位作者 Tien R. Muchtadi Rachel Irene 《World Journal of Engineering and Technology》 2015年第3期26-30,共5页
Indonesia is the largest palm oil producer in the world. The content of β-carotene in palm oil, which can act as pro-vitamin A, is relatively high, so it has great potential for overcoming cases of vitamin A deficien... Indonesia is the largest palm oil producer in the world. The content of β-carotene in palm oil, which can act as pro-vitamin A, is relatively high, so it has great potential for overcoming cases of vitamin A deficiency. By microencapsulation process of palm oil, β-carotene content in palm oil will be more stable and have a longer shelf life. There are three methods of microencapsulation used in this study, namely coacervation, thin-layer drying, and SiO2 absorption technique, which theoretically are suitable for encapsulating β-carotene in palm oil. The aim of this research is to compare and find the most suitable method of microencapsulation process of palm oil to obtain the highest β-carotene content and retention. Results show that those three methods are significantly different in affecting water absorption, solubility in water, yield, microencapsulation efficiency, β-carotene content, and retention of microencapsulated palm oil. The microencapsulated palm oil made from thin layer drying method has the highest β-carotene content at 200.16 μg/g and β-carotene retention of 68.89%. It also has low water absorption and high water solubility, so it can be applied as a powder premix in food as vitamin A supplement. 展开更多
关键词 Β-CAROTENE MICROENCAPSULATION PALM oil Thin layer DRYING VITAMIN A
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Application of Thin Layer Chromatography in Preparation of Drug Containing Serum of Eucalyptus Oil
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作者 Bingyang GUO Yongli YU +2 位作者 Shijuan LUO Xiaoqing YIN Mingzhen XU 《Medicinal Plant》 CAS 2018年第1期19-24,共6页
[Objectives] To explore whether the thin layer chromatography( TLC) can be used to guide the preparation of drug containing serum of eucalyptus oil. [Methods]Eucalyptus oil samples with different dilution ratio were d... [Objectives] To explore whether the thin layer chromatography( TLC) can be used to guide the preparation of drug containing serum of eucalyptus oil. [Methods]Eucalyptus oil samples with different dilution ratio were detected by TLC. Eucalyptus oil was intragastrically administered to mice,serum samples of different eucalyptus oil doses,different intragastric administration methods and different blood sampling times were collected. The above samples were detected by TLC,and the above results were verified by gas chromatography. [Results] TLC can detect concentration difference of eucalyptus oil samples with different dilution ratio. TLC can provide qualitative and semi-quantitative detection of eucalyptus oil in serum. High,medium and low dose of eucalyptus oil in serum had different effects on the growth of MCF-7 cells in the SD rats( P < 0. 05). [Conclusions] TLC can be used to guide the preparation of drug containing serum of eucalyptus oil. 展开更多
关键词 Chinese medicine drug containing serum Eucalyptus oil Thin layer chromatography
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Development of Layered Treatment Technique for Multiple Heavy Oil Reservoirs
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作者 Hu Zhimian and Wu Dehua(Drilling and Oil Production Technique Research Institute of Liaohe Oilfield) 《China Oil & Gas》 CAS 1995年第1期29-32,共4页
DevelopmentofLayeredTreatmentTechniqueforMultipleHeavyOilReservoirsHuZhimianandWuDehua(DrillingandOilProduct... DevelopmentofLayeredTreatmentTechniqueforMultipleHeavyOilReservoirsHuZhimianandWuDehua(DrillingandOilProductionTechniqueResea... 展开更多
关键词 VISCOUS oil RESERVOIR MULTIPLE layer Steam SOAKING STIMULATION
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大庆油田裸眼井测井技术进展与展望 被引量:1
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作者 闫伟林 殷树军 +5 位作者 马宏宇 王雪萍 杨清山 文政 郑建东 覃豪 《大庆石油地质与开发》 CAS 北大核心 2024年第3期109-118,共10页
为了提高大庆油田裸眼井测井技术支撑能力和研究成果领先水平,全面回顾了大庆油田测井采集系列及解释技术的创新发展历程,系统总结了特高含水期剩余油解释、火山岩等复杂岩性测井评价、碎屑岩储量参数解释、非常规油气“甜点”分类、缝... 为了提高大庆油田裸眼井测井技术支撑能力和研究成果领先水平,全面回顾了大庆油田测井采集系列及解释技术的创新发展历程,系统总结了特高含水期剩余油解释、火山岩等复杂岩性测井评价、碎屑岩储量参数解释、非常规油气“甜点”分类、缝洞型碳酸盐岩储层测井评价等油田勘探开发测井评价技术。在客观分析大庆油田勘探开发测井解释评价需求和面临瓶颈问题的基础上,结合当前油田测井评价对象规模小、物性差、埋藏深、地层结构复杂、非均质性强的特点。指明了测井解释评价核心技术主攻方向。围绕新阶段测井采集及解释评价技术体系完善与建立,对高分辨率和成像测井采集、后油藏时期和非常规测井解释评价、新一代智能解释技术体系等未来发展进行了展望。 展开更多
关键词 测井评价 剩余油 水淹层 碳酸盐岩 页岩油 大庆油田
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Chemical Analysis of Some Novel Inorganic Ground Layers from Old Oil Paintings
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作者 Takashiro Akitsu Yu Okamoto Harumi Itoh 《材料科学与工程(中英文B版)》 2011年第5期677-681,共5页
关键词 无机物质 化学分析 油画 接地层 无机晶体材料 UV-VIS 红外光谱测量 无机材料
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奥连特盆地隐蔽油藏高效滚动勘探开发方法技术及应用——以厄瓜多尔14和17区块为例
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作者 王光付 李发有 +8 位作者 孙建芳 徐海 张亚雄 冯玉良 丁峰 叶双江 陈诗望 吴洁 孙钰 《石油与天然气地质》 EI CAS CSCD 北大核心 2024年第1期243-255,共13页
厄瓜多尔14和17区块位于奥连特盆地前渊带,主要含油层系为Napo组的M1,U和T段。现已开发油田进入高含水阶段,资源接替面临挑战。通过基于趋势面驱动的叠后地震数据连片一致性处理、时-频衰减高精度合成记录标定和解释及各向异性变速成图... 厄瓜多尔14和17区块位于奥连特盆地前渊带,主要含油层系为Napo组的M1,U和T段。现已开发油田进入高含水阶段,资源接替面临挑战。通过基于趋势面驱动的叠后地震数据连片一致性处理、时-频衰减高精度合成记录标定和解释及各向异性变速成图,精细刻画了低幅度构造,发现了一批低幅度构造油藏。采用分频迭代去噪拾取薄层弱反射系数,以其重构的叠后宽频有效信号为约束,采用相控波形非线性反演,定量预测了埋深3 000 m的2~5 m厚潮汐水道砂岩,发现了多个M1超薄层岩性油藏。依据区域水动力条件、低幅度构造油藏油-水界面趋势及油藏能量特征,发现了LU水动力油藏并滚动扩边。通过观察大量岩心薄片,发现海绿石在石英砂岩储层中呈胶结物和颗粒两种赋存状态,建立了海绿石双组构测井解释体积模型,评价并识别了UT低电阻率油藏。基于热带雨林地表和隐蔽油藏特点,按照“整体部署、分批实施、跟踪评价、及时调整”的策略,实现滚动勘探、评价和快速建产,探井和评价井成功率大于90%。 展开更多
关键词 水动力成藏 低幅度构造 低电阻率油层 勘探开发策略 隐蔽油藏 奥连特盆地 厄瓜多尔
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稠油油藏体相流体非线性渗流理论模型
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作者 柯文丽 喻高明 +1 位作者 刘延东 贾婷婷 《中国石油大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第4期123-130,共8页
根据稠油油藏体相流体渗流特点,建立基于稠油吸附边界层和屈服特性影响下的稠油体相流体非线性渗流理论模型及启动压力梯度理论公式,并利用岩心渗流与启动压力梯度试验结果对理论模型计算结果进行验证。结果表明:理论计算结果与试验结... 根据稠油油藏体相流体渗流特点,建立基于稠油吸附边界层和屈服特性影响下的稠油体相流体非线性渗流理论模型及启动压力梯度理论公式,并利用岩心渗流与启动压力梯度试验结果对理论模型计算结果进行验证。结果表明:理论计算结果与试验结果拟合较好,启动压力梯度理论公式计算结果平均偏差为7.77%,稠油油藏体相流体非线性渗流理论模型计算结果平均偏差为7.50%,均在可接受偏差范围内,并且该模型针对不同流变类型的流体渗流都具有较好的普适性。 展开更多
关键词 稠油 边界层 体相流体 非线性渗流 启动压力梯度
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风化店地区低阻油层成因分析及识别
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作者 黄金富 王啊丽 +2 位作者 夏国朝 张海霞 杨晓辉 《海洋石油》 CAS 2024年第3期99-104,共6页
针对风化店地区孔店组低阻油层识别困难、测井解释难度大的特点,充分利用测井、录井等资料研究分析低阻油层形成原因。研究认为该区低阻油层受黏土矿物含量、地层水矿化度、薄互层三个方面影响。在系统分析储层四性关系的基础上,分区块... 针对风化店地区孔店组低阻油层识别困难、测井解释难度大的特点,充分利用测井、录井等资料研究分析低阻油层形成原因。研究认为该区低阻油层受黏土矿物含量、地层水矿化度、薄互层三个方面影响。在系统分析储层四性关系的基础上,分区块、分层位建立了储层参数模型和高精度、适用性强的油、水解释图版标准,准确识别低阻油层,及时应用于现场生产中,取得了明显的效果,为进一步开展老油田低阻油层识别、挖潜上产提供了借鉴和技术保障。 展开更多
关键词 低阻油层 成因机理 测井解释 油水识别
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姬塬地区长8油层组储层特征分析
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作者 廖宇斌 李涛 +3 位作者 于志栋 肖骁 王守志 刘国文 《科学技术与工程》 北大核心 2024年第6期2246-2254,共9页
为确定长8油层储层现今表征,储层物性受黏土矿物胶结物控制模式,储层沉积作用和沉积后期所经历的成岩变化,通过铸体薄片、扫描电镜等方法研究了储层基本特征和成岩作用及沉积作用,在整体低渗的背景下,部分位于相对渗透率较高区域的油井... 为确定长8油层储层现今表征,储层物性受黏土矿物胶结物控制模式,储层沉积作用和沉积后期所经历的成岩变化,通过铸体薄片、扫描电镜等方法研究了储层基本特征和成岩作用及沉积作用,在整体低渗的背景下,部分位于相对渗透率较高区域的油井有较高的产量,理清研究区长8储层富集规律,对地区内岩石孔隙度下降因素进行剖析。结果表明,姬塬地区有利储层多发育水下分流河道和河口坝沉积,特别是砂体中心部位储层物性是最好,可见长8油层组的储集性能和渗流性能好,即粒间孔型、粒间孔+溶孔型和溶孔+粒间孔型。溶孔型、粒间孔+微孔型两种孔隙组合类型的渗流性能较差。微孔型和溶孔+微孔型两种孔隙组合类型的储集空间主要由半径极小的微孔构成,连通性较差,其孔隙内表面积和渗流阻力,储集性能和渗流性能较差。 展开更多
关键词 鄂尔多斯盆地 长8油层组 姬塬地区 储层特征 主控因素
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多分支废弃油井层温衰减规律及注入参数对注采性能的影响
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作者 石昌帅 王成之 祝效华 《天然气工业》 EI CAS CSCD 北大核心 2024年第2期178-187,共10页
利用废弃油井开发地热资源是降低地热开发成本、促进商业推广的有效措施,其中层温衰减规律对地热系统取热效果具有重要影响。为此,以废弃油井储层为研究对象,结合泰森多边形理论对储层裂缝进行了划分,建立了三维油水两相热流耦合数值模... 利用废弃油井开发地热资源是降低地热开发成本、促进商业推广的有效措施,其中层温衰减规律对地热系统取热效果具有重要影响。为此,以废弃油井储层为研究对象,结合泰森多边形理论对储层裂缝进行了划分,建立了三维油水两相热流耦合数值模型,分析了不同储层条件与布井结构下的层温衰减规律,探究了注入参数等因素对地热注采性能的影响。研究结果表明:(1)低渗透储层抽采30年生产温度最大差值可达22.08 K,高渗透储层(1.0×10^(-13) m^(2))温度过度衰减,长年限采热效率低;(2)储层含油率与生产温度和发电功率呈正相关关系,生产30年后差值最大可达11.57 K与0.12 MW;(3)分支井沿垂直方向会形成低温波谷,层温衰减高于储层其余部分,数量增加对注采影响小;(4)注入速率与发电功率、生产温度分别呈正、负相关关系,但注入速率超过89 kg/s时不利于长年限开采。结论认为:(1)储层取热性能对初始渗透率最为敏感,注入速率与储层含油率次之,优先开发低渗透储层有利于长年限采热;(2)应利用油田地热降低稠油黏度,形成地热辅助采油模式,以实现经济效应最大化;(3)选取6支分支井与89 kg/s的注入速率可得到可观取热效果和较好的经济效益。 展开更多
关键词 地热系统 废弃油井 泰森多边形 离散裂缝网络 初始含油率 层温衰减 取热性能 多分支井
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华庆油田H201延8油藏小层划分方案及地质意义
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作者 张亮 杨洋 +1 位作者 孙博 廖炜诺 《石化技术》 CAS 2024年第8期227-229,共3页
在充分吸收前人对H201延8油藏的地质认识的基础上,结合新、老井资料对研究区标志层及各小层电性响应、岩性组合、沉积旋回特征进行深入研究,基于以上研究成果将研究区内的延8地层重新划分为延81、延82、延83三个小层,利用划分结果绘制... 在充分吸收前人对H201延8油藏的地质认识的基础上,结合新、老井资料对研究区标志层及各小层电性响应、岩性组合、沉积旋回特征进行深入研究,基于以上研究成果将研究区内的延8地层重新划分为延81、延82、延83三个小层,利用划分结果绘制地层剖面及构造图,对地层厚度及平面展布特征进行了研究。其中,延8地层整体厚度介于27~42m之间,各小层间厚度相差不大,平面上整体呈现东高西低的趋势,北部较南部坡降大,内部发育局部微构造高点。 展开更多
关键词 H201 延8油藏 小层划分 标志层
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Deepwater and Deep Layers: the Strategic Choices for China's Oil and Gas Resources Development
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作者 Liu Chao 《China Oil & Gas》 CAS 2017年第4期55-55,60,共2页
On December 2, 2017, the 2nd Seminar on the Development Strategy of China's Oil and Gas Resources was held in Beijing. This seminar was hosted by the Strategic Research Center for Oil and Gas Resources, Ministry of L... On December 2, 2017, the 2nd Seminar on the Development Strategy of China's Oil and Gas Resources was held in Beijing. This seminar was hosted by the Strategic Research Center for Oil and Gas Resources, Ministry of Land (MLR) and Resources and sponsored by both the CNOOC Exploration Department and the School of Ocean and Earth Sciences of Tongji University. With the theme of "deepwater and deep-layer oil and gas resources and development strategy", 展开更多
关键词 China's oil and Gas Resources Development Deepwater and Deep layers
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利用长水平井实现超薄层未动用储量有效开发——以下二门油田梨树凹区块为例
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作者 李伟才 刘宇 +2 位作者 张云 杨璐 闫荣杰 《石油地质与工程》 CAS 2024年第3期18-22,共5页
泌阳凹陷下二门油田梨树凹区块受有效厚度薄、含油层位单一、储层物性差、单井产量低等因素限制,探明储量动用程度低,开发效果差。为提高该区储量动用程度,积极推广应用水平井开发技术,通过加强油藏地质综合研究,进一步落实了可动用潜力... 泌阳凹陷下二门油田梨树凹区块受有效厚度薄、含油层位单一、储层物性差、单井产量低等因素限制,探明储量动用程度低,开发效果差。为提高该区储量动用程度,积极推广应用水平井开发技术,通过加强油藏地质综合研究,进一步落实了可动用潜力;地质工程一体化实施过程中,通过多靶点+近钻头方位伽马技术严控水平段轨迹,提高了储层及油层钻遇符合率;通过优化射孔井段,提高了单井产量,逐步形成了一套适合河南油田薄层油藏长水平井开发技术。现场实施结果表明,水平井实钻水平段长达892 m,储层钻遇符合率为100%,油层钻遇符合率为91.4%,初期日产油14.1 t。该区块水平井的成功实施,为超薄层油藏挖潜技术指出方向,对河南油田未动用储量的有效开发具有一定的指导意义。 展开更多
关键词 河南油田 梨树凹区块 未动用储量 长水平井 薄层油藏
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电容屏破损缺陷局部放电过程规律特征及仿真分析 被引量:1
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作者 杨帆 张玉琛 +2 位作者 王鹏博 吴兴旺 吴杰 《电工技术学报》 EI CSCD 北大核心 2024年第9期2860-2872,共13页
油纸电容式变压器套管因性能好、成本低而被广泛采用。当电容屏存在边缘破损工艺缺陷时易发生局部放电,进而会改变油纸绝缘性能,缩短套管使用寿命,严重时危及电网设备安全运行。为研究电容屏破损局部放电过程变化规律,明确放电发展阶段... 油纸电容式变压器套管因性能好、成本低而被广泛采用。当电容屏存在边缘破损工艺缺陷时易发生局部放电,进而会改变油纸绝缘性能,缩短套管使用寿命,严重时危及电网设备安全运行。为研究电容屏破损局部放电过程变化规律,明确放电发展阶段,该文搭建了缺陷套管放电实验模型分析局放过程中相位谱图、放电量等参数发展规律,并基于实验规律及流体漂移扩散理论、固体双极电荷传输理论,建立了末屏缺陷针板沿面放电过程仿真模型,结合仿真中电荷形态变化、放电时间及油纸界面电荷密度分布对电容屏破损放电过程进行阶段划分:放电初始阶段,铝箔尖端电荷聚集发生电晕放电;放电发展阶段,尖端处带电粒子在电场作用下向油纸发展,小部分达到油纸界面产生沿面放电;放电破坏阶段,经过长时间沿面放电进入油纸发生预击穿,电场强度更大使带电粒子能量更高,冲击油纸表面造成油纸表面纤维素断裂炭化形成通道。仿真结果与实验结论相对应,证明了仿真的有效性。该文的研究成果进一步阐明了油纸套管电容屏工艺缺陷局部放电的过程及机理。 展开更多
关键词 油纸套管 电容屏工艺缺陷 针-板沿面放电 电荷分布仿真 放电过程阶段
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考虑两层相关性的腐蚀油气管道失效概率计算方法
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作者 王赤宇 虞维超 +6 位作者 陈磊 张华斌 张杰 王超 王子宇 廉凌峰 黄辉荣 《石油科学通报》 CAS 2024年第5期819-830,共12页
在腐蚀油气管道失效概率计算中,存在随机变量相关和腐蚀缺陷相关的两层相关性。针对当前腐蚀管道可靠性评价中对相关性影响的研究不足,本文提出了考虑两层相关性影响的腐蚀油气管道失效概率计算方法。该方法首先基于Copula函数对具有相... 在腐蚀油气管道失效概率计算中,存在随机变量相关和腐蚀缺陷相关的两层相关性。针对当前腐蚀管道可靠性评价中对相关性影响的研究不足,本文提出了考虑两层相关性影响的腐蚀油气管道失效概率计算方法。该方法首先基于Copula函数对具有相关性的随机变量进行抽样,结合管道失效极限状态方程,计算单个腐蚀缺陷的失效概率。进一步采用系统可靠性理论,考虑缺陷间相关性,对含多个腐蚀缺陷的腐蚀油气管道失效概率进行计算。并以我国某条天然气管道的实际数据为例,采用拉丁超立方抽样方法研究了两层相关性以及缺陷数量对管道失效概率的影响,并基于敏感性分析,量化了随机变量相关系数和腐蚀缺陷相关系数对腐蚀油气管道失效概率的影响。结果表明,缺陷相关性对管道失效概率计算影响明显高于随机变量相关性。小孔泄漏和爆裂失效概率随着缺陷之间相关系数的增大而减小,随着缺陷数量的增加而增大。随机变量相关性对管道小孔泄漏失效概率没有影响,管道爆裂失效概率随着壁厚与管径相关系数的增大而减小,随着初始缺陷长度与深度的相关系数增大而增大。缺陷轴向与径向增长速率相关系数的增大对管道爆裂失效概率的影响具有双向性,预测周期内大约前16年随着相关系数的增大,管道爆裂失效概率增加,大约25年后随着相关系数的增大,随相关系数增大而降低。研究成果适用于分析含多个腐蚀缺陷的油气管道可靠性评价,对管道安全运行、油气资源平稳供应具有参考意义。 展开更多
关键词 腐蚀油气管道 双层相关性 拉丁超立方抽样 可靠性 失效概率
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油液多层过滤去固分离及特性分析
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作者 龚海峰 唐治知 +3 位作者 彭烨 梁鑫鑫 余保 李书龙 《石油学报(石油加工)》 EI CAS CSCD 北大核心 2024年第2期523-533,共11页
针对油-固体系中单层滤网无法同时满足过滤精度高与使用寿命长的问题,采用多层过滤器并对其去固分离特性展开分析。通过耦合流场控制方程、颗粒运动方程、颗粒-壁面碰撞模型方程,建立了适用油-固体系的多层过滤数值分析模型,探究了油-... 针对油-固体系中单层滤网无法同时满足过滤精度高与使用寿命长的问题,采用多层过滤器并对其去固分离特性展开分析。通过耦合流场控制方程、颗粒运动方程、颗粒-壁面碰撞模型方程,建立了适用油-固体系的多层过滤数值分析模型,探究了油-固体系中多层过滤器的去固分离特性,分析了入口流速和滤网层数对流场特性及过滤比(β)的影响。结果表明:多层过滤器可有效过滤孔径与粒径比(k_(d))大于15的固体颗粒;增加滤网层数,d_(5)和d_(20)(β分别为5和20时对应的颗粒粒径)显著降低;增大入口流速,d_(5)和d_(20)变化较小;当β<5时,颗粒粒径的变化对过滤比的影响较小;当β>5时,颗粒粒径的小幅增大可能导致过滤比显著提高。 展开更多
关键词 多层过滤 油-固分离 流场特性 碰撞模型 过滤比 分布云图
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